Typewriters.
They had bars that needed to physically move, and so staggering them helped them not collide and get jammed.
If you imagine a bar coming from the center of each key towards your screen, you can see how the staggering was helpful. For instance, M misses J and K above it, naturally, but it also slightly misses I and the 8 above that.
It’s a great solution for a nonexistent problem in keyboards.
Nah it propagates. I wanna say it goes at light speed, but there is a delay. If this is actually referencing something new, maybe that’s different now.